Fix typos for the README of the metrics/metrics_56 views

Author: JesperWisborgKrogh

README.md

@@ -1315,11 +1315,11 @@ Creates a union of the following information:
    *  Performance Schema global memory usage information
    *  Current time
 
-The difference betweem the metrics and the metrics_56 views are whether the global status is taken from performance_schema.global_status instead of
-from the Information Schema.Use the metrics view if the MySQL version is 5.7.6 or later and show_compatibility_56 = OFF. Otherwise use metrics_56.
+The difference between the metrics and the metrics_56 views are whether the global status is taken from performance_schema.global_status instead of
+from the Information Schema. Use the metrics view if the MySQL version is 5.6, 5.7.5 and earlier, or 5.7.6-5.7.8 with show_compatibility_56 = OFF. Otherwise use metrics_56.
 See also https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_show_compatibility_56
 
-In MySQL 5.7.6 and later the metrics_56 view will generate one warning that INFORMATION_SCHEMA.GLOBAL_STATUS is deprectatedd.
+In MySQL 5.7.6 and later the metrics_56 view will generate a warning that INFORMATION_SCHEMA.GLOBAL_STATUS is deprecated.
 
 For view has the following columns: